GLSA-200711-30 : PCRE: Multiple vulnerabilities

High Nessus Plugin ID 28319

Synopsis

The remote Gentoo host is missing one or more security-related patches.

Description

The remote host is affected by the vulnerability described in GLSA-200711-30 (PCRE: Multiple vulnerabilities)

Tavis Ormandy (Google Security) discovered multiple vulnerabilities in PCRE. He reported an error when processing '\\Q\\E' sequences with unmatched '\\E' codes that can lead to the compiled bytecode being corrupted (CVE-2007-1659). PCRE does not properly calculate sizes for unspecified 'multiple forms of character class', which triggers a buffer overflow (CVE-2007-1660). Further improper calculations of memory boundaries were reported when matching certain input bytes against regex patterns in non UTF-8 mode (CVE-2007-1661) and when searching for unmatched brackets or parentheses (CVE-2007-1662).
Multiple integer overflows when processing escape sequences may lead to invalid memory read operations or potentially cause heap-based buffer overflows (CVE-2007-4766). PCRE does not properly handle '\\P' and '\\P{x}' sequences which can lead to heap-based buffer overflows or trigger the execution of infinite loops (CVE-2007-4767), PCRE is also prone to an error when optimizing character classes containing a singleton UTF-8 sequence which might lead to a heap-based buffer overflow (CVE-2007-4768).
Chris Evans also reported multiple integer overflow vulnerabilities in PCRE when processing a large number of named subpatterns ('name_count') or long subpattern names ('max_name_size') (CVE-2006-7227), and via large 'min', 'max', or 'duplength' values (CVE-2006-7228) both possibly leading to buffer overflows. Another vulnerability was reported when compiling patterns where the '-x' or '-i' UTF-8 options change within the pattern, which might lead to improper memory calculations (CVE-2006-7230).
Impact :

An attacker could exploit these vulnerabilities by sending specially crafted regular expressions to applications making use of the PCRE library, which could possibly lead to the execution of arbitrary code, a Denial of Service or the disclosure of sensitive information.
Workaround :

There is no known workaround at this time.

Solution

All PCRE users should upgrade to the latest version:
# emerge --sync # emerge --ask --oneshot --verbose '>=dev-libs/libpcre-7.3-r1'

See Also

https://security.gentoo.org/glsa/200711-30

Plugin Details

Severity: High

ID: 28319

File Name: gentoo_GLSA-200711-30.nasl

Version: 1.20

Type: local

Published: 2007/11/26

Updated: 2018/07/11

Dependencies: 12634

Risk Information

Risk Factor: High

CVSS v2.0

Base Score: 7.5

Temporal Score: 5.5

Vector: CVSS2#AV:N/AC:L/Au:N/C:P/I:P/A:P

Temporal Vector: CVSS2#E:U/RL:OF/RC:C

Vulnerability Information

CPE: p-cpe:/a:gentoo:linux:libpcre, cpe:/o:gentoo:linux

Required KB Items: Host/local_checks_enabled, Host/Gentoo/release, Host/Gentoo/qpkg-list

Exploit Available: false

Exploit Ease: No known exploits are available

Patch Publication Date: 2007/11/20

Reference Information

CVE: CVE-2006-7227, CVE-2006-7228, CVE-2006-7230, CVE-2007-1659, CVE-2007-1660, CVE-2007-1661, CVE-2007-1662, CVE-2007-4766, CVE-2007-4767, CVE-2007-4768

GLSA: 200711-30

CWE: 119, 189